CVE-2009-3127: Microsoft Compatibility Pack Word Excel PowerPoint

High severity, CVSS 9.3. EPSS: 25.1% chance of exploitation in the next 30 days.

Microsoft Office Excel 2002 SP3 and 2003 SP3, Office 2004 and 2008 for Mac, Open XML File Format Converter for Mac, and Office Excel Viewer 2003 SP3 do not properly parse the Excel file format, which allows remote attackers to execute arbitrary code via a crafted spreadsheet, aka "Excel Cache Memory Corruption Vulnerability."

Affected products

• Microsoft Compatibility Pack Word Excel PowerPoint: version 2007 only
• Microsoft Excel: version 2002 only; version 2003 only; version 2007 only
• Microsoft Excel Viewer: any version; version 2003 only
• Microsoft Office: version 2004 only; version 2008 only
• Microsoft Open XML File Format Converter: any version

Published 2009-11-11. Last modified 2026-06-16.